cubicweb-awstats #3603309 update to cw 3.15 API [validation pending]

import cubicweb.predicates instead of cubicweb.selectors.

prioritynormal
typeenhancement
done in0.2.0
load0.100
load left0.000
closed by#c34b61f2dbed use cubicweb.predicates instead of deprecated cubicweb.selectors (closes #3603309)
patchuse cubicweb.predicates instead of deprecated cubicweb.selectors (closes #3603309) [applied]